| Schedule of Long-term Debt Instruments [Table Text Block] |
| | | | | | | | | Senior unsecured notes | | $ | 212,546 | | | $ | 212,546 | | | Unamortized discount | | | | ) | | | (1,771 | ) | | Unamortized debt issuance costs | | | | ) | | | (2,995 | ) | Senior unsecured notes less unamortized discount and | | | | | | | | | | debt issuance costs | | | 208,039 | | | | 207,780 | | | Revolving credit facility | | | – | | | | – | | | Mortgage loan obligations | | | 15,258 | | | | 15,745 | | | Unamortized premium - mortgage loan obligations | | | 47 | | | | 75 | | | Unamortized debt issuance costs - mortgage loan obligations | | | | ) | | | (74 | ) | | Capital lease obligations | | | 223 | | | | 211 | | | Total long-term debt and capital leases | | | 223,509 | | | | 223,737 | | | Less current maturities | | | 9,781 | | | | 9,934 | | | Long-term debt and capital leases, less current maturities | | $ | 213,728 | | | $ | 213,803 | | |